In collaboration with law enforcement agencies around the world, Bitdefender has released an updated decryptor for the GandCrab Ransomware that can decrypt files encrypted by versions 1, 4, and 5 through 5.2. This decryptor is not being made available due to a flaw in the encryption algorithm. The security firm in collaboration with Europol was able to gain access to the encryption system to download the decryption keys needed to decrypt a victim’s files.Instructions on how to use the Gandcrab decryptor can be found at the end of the article.
Source: https://www.bleepingcomputer.com/news/security/release-of-gandcrab-52-decryptor-ends-a-bad-ransomware-story/